References
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- Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for Community action in the field of water policy.
- Hill, M. O., 1979: TWINSPAN — A FORTRAN Program for Arranging Multivariate Data in an Ordered Two-Way Table by Classification of the Individuals and Attributes. — Ecology and Systematics, Cornell University, Ithaca, New York. 90 pp.
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- Reynolds, C. S., 1984: Phytoplankton periodicity: the interaction of form, function and environmental variability — Freshwater Biol. Spec. Rev. 14: 111–142.
- Thomas, R., Meybeck, M. & Beim, A., 1996: — Rivers — In: Chapman, D. (ed.): Water Quality Assessments: a Guide to the Use of Biota, Sediments and Water in Environmental Monitoring, 2nd edition: 243–318 — E & F N Spon, London.